Vishal Shah has put together TPHP, which stands for “The Perfect Home Page”. It is just an HTML page with a bunch of JavaScript in it, that acts as a command line to a lot of things.

You can type in special codes to do smart things like search wikipedia, access domain tools, or what have you.

Of course, this is primitive compared to something like Enso, which was made open source when the team went to Mozilla. It is also now running on Mac and Linux, and it has the feeling that it could be a nice companion to the browser as a command line.